	@media screen and (min-width:1200px) {
	  html {
	    font-size: 20px;
	  }
	}

	@media screen and (min-width:800px) and (max-width:1200px) {
	  html {
	    font-size: 16px;
	  }
	}

	@media screen and (max-width:800px) {
	  html {
	    font-size: 12px;
	  }
	}

	* {
	  margin: 0;
	  padding: 0;
	  box-sizing: border-box;
	}

	html,
	body {
	  width: 100%;
	  height: 100%;
	  font-family: '幼圆';
	}

	div {
	  width: 30rem;
	  height: 19rem;
	  margin: 2rem auto;
	  border-top-left-radius: 1rem;
	  border-top-right-radius: 1rem;
	  overflow: hidden;
	  position: relative;
	}

	div p {
	  width: 30rem;
	  height: 15rem;
	  text-align: center;
	  border-top-left-radius: 1rem;
	  border-top-right-radius: 1rem;
	  padding-top: 2rem;
	  position: absolute;
	  top: 0;
	  left: 0;
	  color: white;
	}

	div p b {
	  display: block;
	  margin-top: 2rem;
	  font-size: 1rem;
	}

	div h1 {
	  width: 30rem;
	  height: 15rem;
	}

	div ul {
	  width: 30rem;
	  height: 4rem;
	  list-style: none;
	  background-color: black;
	}

	div ul li {
	  float: left;
	  width: 7.5rem;
	  height: 4rem;
	  text-align: center;
	  line-height: 4rem;
	  color: white;
	  cursor: pointer;
	  opacity: .8;
	  transition: all 0.5s;
	  border-right: 0.05rem solid white;
	}

	div ul li:hover {
	  opacity: 1;
	}

	div li:nth-child(1) {
	  background-color: #F56C6C;
	}

	div p:nth-child(1) {
	  background-color: #F56C6C;
	}

	div p:nth-child(2) {
	  background-color: #67C23A;
	}

	div p:nth-child(3) {
	  background-color: #409EFF;
	}

	div p:nth-child(4) {
	  background-color: #E6A23C;
	}